Hoisting apparatus



Oct. 16, 192 8. 1,688,170

C. ZETTERLUND H01 STING APPARATUS Filed Aug. '20. 1925 4 Sheets-Sheet 1' Eqi.

A m w Oct. 16, 1928.

1,688,1 70 C.ZETTERLUND 1 HOI STING APPARATUS 4 sheets-sheet 2 Filed Aug. 20, 1925 Oct. 16, 1928.

C. ZETTERLUND HOISTING APPARATUS Filed Aug. 20, 1925 4Sheets-Shet Oct. 16, 1928.

C. ZETTERLUND HOISIING APPARATUS Filed Aug. 20. 1925 4 "ha 1.11;; which mesh with a gear on a drun. drum may be alternately rotated in reverse Patented Get. 16, 1 928.

' UNITED STATES meme PATENT oFrtoE.

CARL rZ ETTERLUND, OF CHICAGO, ILLINOIS.

.I-IOISTIIJG APPARATUS.

Application 'filcd August 20,

My invention relates broadly 'to hoists or elevating machmesused particularly for ele- -vatingbuiltling m'aterial'antl similar objects to higherylevels, say "in the construction of huildings,-and has particular reference to machineot this type which is automatic i the operation *of stoppingthe platforms or cages when reaching a predetermined level.

W'Vhile l shall-describe myinvention particularly adaptable for elevatingbuildmganaterial and similar objee'tsin the construction of a building and automatic in the manner above described, it will 'be understood that my invention maybe used for elevating other objects, whether-ofsimilar or dissimilar nature,'while on the'other hand, it may embody certain features of novelty hereinafter disclosed without being au'tomatic'in the operavide an improved "form (if construction wherein the power apparatus employed in a y he contrdlleditrom a distance,' in the present ll'l canoe eing the level to which the material is elevated, so llllahOLlllSlClG of the workmen at this level,-no workman other 'than those'a tthis level will be required to operate the machine controlled from 'a'single point, with the resultthat the machine may be operated with greater safety. I

l'i'still "further object of my invention is to provide a strncturewhere'in the mechanism for elevating the platforms comprises an improved type of reversing mechanism a drive shaft provided with gears This direction to wind and unwind the cable leadto'the platformaby means of a clutch member which is shifted to engage either gear with the drive shaft A neutral position may "be obtained by the clutch men'ber,

and it is within the scope oi this invention to provide'an improved form of locking member tor locking the clutch member "in neutral position, whereby the platforms are held in ent 'bodiment of my invention, a'base isadapt 1925. Serial No. 51.500.

locked at the level to which they have been carried. I

A further ob ject ot my invention;is to pro- 'vide an improved "form of control whereby when the platforms reach their "intended levels, the power isqiiicklychecked and the clutch member 'is shifted to nentral position.

A still further object'of my invention :resides in-an improved formof pawl and ratchet mechanism which prevents -aocidental reverse rotation of'the drum.

Other objects and advantages of my invention willbe apparent 133011113116 following detailed description when taken "in connection with the accompanying-drawings which form a part thereof. In the drawings:

Figure 1 is a topplan view of a machine embodying my invention"; m

Fig. 2 is a side elevation of the same;

Fig. Bis an elevation of the opposite side;

Fig. 4 is a rear view of the elevator frame carrying the plattorms;

Fig. 5 is an enlarged sectional view taken -horizontally through the reversing mechan sm;

Fig. '6 'is a detail view ofthe tripping ele- 'Fig.'7 is a-view illnstratinga type'oftprime that may be employed "herein to pro vide suitable form of speed check for *the power shaft as either platform descends.

Reterringfmore.particularly to the drawings wherein I have shown a=preferred-en1- ed to carry the uprights or standards 11 which are connectedatthetop'by across member Q52. A central standard 131s likewisesnitablycarried and connected at its top to'cross'member 12, and between these stan dards th'o elevator cages or platforms 1411118158113 giiided for operation. The standards comprise'themain supporting:frame of the platforms, which frame maybe of any s uitable-size, form'and material,'but preferably of wood or metalrand of a'height capable of reaching'the desired jlevel'to'wliich'the platforms are to elevate material, in some mstancestotenor more stories,

which is quite common in 'th e construction 'of modern skyscrapers. Supported by the'top cross mem'ber12 are the sheaves 16 and 17 about which'the ends o'fa cable 18 are 'trained for connection to said platforms "l4 and This cable is adapted alternately to raise (and lower the platforms, and, as a consequence,

' tail, it will be observed that V shaft 21 is axially bored for a distance to accommodate an axially movable rod 25. The

when one end of the cable is being wound upon a drum 19, the other end 1s be ngreleased, which action results in the raising of one of the platforms and in the lowering of suitable source and maybe journaled in bearings 22 and 23 carried by the frame members 24, which are supported on base 10. By referr ng particularly to Figs. 1. 2 and 5 wherein this reversing mechanism is shown in dethe free end of inner end of this rod is provided with a right angle bend 26 which projects outwardly through an opening 21 in red 21 and to which is I fastened a shiftable clutch element 27 guided adjacent its ends by transversely extending apertured lugs 28 suitable fixed upon power shaft 21 forrotation therewith. At this point it will be. apparent that the purpose of this clutch element is alternately to engage either one of a pair of dogs '29 and 30 carried by suitable gears 31 and 32 having relative rotation with respect to power shaft 21. Gears 31 and 32 arein'constant meshwith a bevel gear This bevel .q'ear may be made ntegral with drum 19. or it maybe formed separately and then fastened thereto in any suitable manner. From the above description it will be observedthat thelougitudinal shiftmg. or axial movement of rod 25 will alternately engage clutch member 27 with gears 31 and 32. and thereby cause alternate opposite rotation ofbevel gear and consequen ly a similar movement of drum 19.

The successive engagement and disengagement-of the gears 31 and 32'with power shaft 21,;providing the alternate rotation in opposite directions of the drum '19 is effected through. atrip cam 39 adjustably carried on the center standard l3preferably at one ofa series of holes 31'. Saidtrip cam 39 is fired on the inner end of a crank 44 extending through thecenter standard 13 in journal-ed relation. A groovedpullev 33' may also be carried on this inner end of crank 44 for the purpose of TQCGlVlDQ the upperoon of a cable35. both strands of which cable extend downwardly and under a double sheave 36.- thesestrands being designated 37 and 38 in Fig. 5. :The ends of strands 37 and are his tened to the ends of an actuating arm 40 which may be pivotally mounted in a horizontal position on a lateral projection or shelf 46 carried by the right hand frame'member 24.

The outer end of rod 25 is provided with a V groove 41 adapted to project through an eye 42 carried by actuating arm40. Inasmuch as this actuating arm 40 is pivoted to the projection 46 by means of a pivot pin 43, it may be easily swung about its mounting by the strands 37 and 38 whereby the rod will be axially shifted either, to bring the clutch member 27 into alternate engagement with the dogs ongears 31 and 32, or to shift the clutch to a neutral position, as shown in Figure5.

A novel form of locking device maybe provided tohold the actuating ar1n40 in the position ,QlVQIl it by either strand of the cable 35, which locking device comprises a pivotally mounted arm 47 carried at 48 on the frame member 24 andadapted to swing in a vertical plane so as to bring its inner edge into locking engagement in a groove49 provided inthe actuating member 40- It will be observed in 5 that the actuating member 40 is provided with a lateral extension 50 intermediate its ends and this extension is adapted to carry the pivot pin 43, which mounts the same on projection 46, and is also fittedhvith this groove 49. A pair of downwardly proj eoting fingers 51 and 52, somewhat arcuate in formation, are provided on arm 47 to abut against an edge of actuating arm 40., these fingers servingin effect to straddle the lateral projection'5O andengage the actuating arm on the opposite sides thereof. A. spring 55 normally tends to hold. locking arm 47 in engagement with groove 49. This is accomplished by providing a vertical projection 56 on actuating arm 40 and-a similar projection 57 on the locking arm-47.

It will be noted that the sides of groove49 are somewhat curved and that the distance between the actuating arm 47 and the center of pivot pin 43 is less than the distance between the center of this pin andthe'fingers 51 and 52; consequently, when a pulling force is applied by the strands 37 and 38 of cable 35 to the. arm 40 at either end, either finger 51 or 52, depending at which end this pulling force is applied, willtend to force the locking arm 47 out of engagement with groove 49. In other words, the fingers 51 and 52 carried by the locking member 47 tend to hold the actuating arm 40 rigid during the time when the hoist is not in operati on, at which time, the rod 25 will be holding said clutch member 27 in neutral position. 1

It will be apparent that when the trip 39 .is set in either dotted line position. as shown in Figure 6, one of and 38 will be pulled upwardly to pull the corresponding. side of actuating arm 40forwardly, whereupon the rod 25 will shift to engage the clutch member 27 witheither of the dogs 29 and 30 on the gears 31 and 32. This action immediately starts, the drum 19 to rotate, in p the strands 37 lllU nessnrro y ,3

either direot'ionyto 'rziiseend lower the elevator platforms '14 and :15. If trip com 739 is setlin the left-hand dotted line position shown in Figure 6, the ascending e evator platform Mwill strike against it andiniove it to its :full line or vertical positiones shown'in thisiigure. This immediately causes the strand 37 to bringitsendofactuating-arm 4L0 forwardly soithet the actuating arm will heinlestrsight line or at ri 'ht angles to the axis of TOCl 26. Int-his event'the clutch llllllbQY'QTlS shifted to 'itsneutrel position as shown'in Figure 5, and the 1 drive shaft 321 is disengaged.

Assuinethet 'it is desirable to. startthe hoist operating enjoin the workmen on the level to which'tl'ie plet'lorn'i :14 has been carried will, by meens of crank 4. L, swing the trip arm to the right-hand dotted position-shown in Fi ure 6, whereupon the strand 3? :oontinues to pullthecorresponding end ofsotuating arm 4:0 forwardly to shift the rod inwardly, whereuponithe clutch member 27 engages with dogi29 to connect the gear 31 with drive shaft 21. The drum 19 will egoinrotate, hutthis timethe elevatorplatform '15 ascends and the platform 1.4 descends. is soon as platform 15 approaches the'level at which the trip cam 39 is mounted on the center standard "13, it will engegc'this com to swing it upwardly to a vertical position, whereupon the gear 3l is immediately disengaged from the drive-shaft '21. The HIJVGIHGHhOf trip cam 39 from its right-haul dotted line position to its full line position as shown'in Figure 6 is vinstsn'liieient to shiittthe clutch member 27 out or engagethecenter standard "13 has its'ends extending in a manner so as to begged by eit ier plat- 'form 14 and 15-wlientlieyinovetotheir lower pOEJltTiOH. A control vertically projecting arm 62'is furnishedon segment and to this arm one end otn eelhle 63 is fastened. A pulley heismountedhelow the segment 60 for guiding the cable 63, the latter extending to the source ofpower as shown in Fig.7, so that the speed o'i the power shaft 21 will be decreased when slack is placed in the cable 63.

This is accomplished by either-end ofthe segment ()0 moving downwardly by engagement with either of the elevator platforms A spring tends'to ineint in the'seg'ment 60 in the position shown in i in ure it. Thus the cheekerh which facilitates disengaging the some from the reversing geer mechanism shown herein.

5 may be attached et'onerend'ito any so.

.slly move throttle v21 position .and thereby be suitebl from the ,i neets the pin ,75 with one end ot actueti zind'Tl respectively. Link 71 pawl 72,-"

bolt- 811ney passeentrollv through the her80. The outer end of bolt 81 is redi and reeeives'oneend of spri T M.

the outer end of on In Eig. 7 I have illustrated one .i'orin ot control adapted for operation by the speed :21. Athrottle valve -Ellis QHOTidQCl in the intake manifold ofthe en ine and is held closed position bye sprmgtl. Th1

N l) L l L r. able permanent frame :member, and at the other end to the 'throttlelever9e. V'Ihen ceblehl is rele sed :by either 'plsitforn'i :lowering spring 98 moves lever 9 .5; iorwerdlyto 'gradin 91 towards closing 0 inon'ienturily check #5 the speed o'f'power sh rt2l. 7

Means may be provided to locllvthe drum against rototionis ndthereby'loch'theevotor platforms against movement when it is desired to hold them at a certain level. This mechani m icomprises a pawl and ratchet errnngementen'd may be emho' died in the t 111 shown in the drawings wherein the pe erel edge-s TOondTIofthe drumlilere toothed end zirendepted to he engaged by pawl inom- '19 here 1 and T3. The position oi thefe o wl membi controlled by the mo ement 1 o. actuatin arm 4-0. I prefer to mount the V l 1 0 pow-i isin" .o. reletionon pin'foi which carried in 5113831121 9, Teen:

elnenieniher 2-1. h. linl: 7? conurm 40 whereby movement otthis so as itoeellow i'for eloose connec this being; had ly means oextending .0m the pawl mend riding); i. slot 79 in the ll'llli 77. The drum 19 may he mounted upone vertical support -80 extendinnupwardly from the hose A oi: i= re *uzn 19 to clamp the "latter to "the supporting an em springprovides a snap action for the ps 72 end/F3 in their engagement with the rate ets 70 and 71, VFhen either pawl is moved past-the deadcenter line, the spring eccelerv1115 'etes the movemont'end tends to hold the psiwl in engagement i ith its cooperating ratchet. ldhe opposite end of sprmpyfl?) vcured to arm 83 eerried by pewls.

From the fore oinpt descriptioin the operation of my invention will heohvious. Assumethat the machine is about-to be operated forms 14 and 15 will then be raised and lowered in alternative relation. ll hen these platforms approach the desired level, the drive shaft 21 is automatically disengaged and the operation of the hoist steps. This automatic feature is the result of one of the platforms engaging the trip cam 39. The clutch member of reversing mechanism will remain in neutral position during this time and will not again engage the drive shaft until the cranl: 32 is operated to swing the trip cam to horizontal positioni lVithout further elaboration, the foregoing will so fully explain the of my inventirm that others may, by applylng current knowledge, readily adapt the same for use under varying conditions of service without eliminating certain features which may properly be said to constitute the essential items of novelty involved, which items are intended to be defined and secured to me by the following claims. I a i ll claim:

'1. A hoist of the type described including I a plurality of opposed platforms adapted to be alternately raised and lowered and provided with a reversible driver and means for engaging and automatically disengaging: said drive to start and stop the movement of said platforms, said means being operable in different positions at the level at which said platforms are elevated and engageable by said platforms to disengage said drive.

2. A hoist of the type described includin plurality of opposed platforms provided with a reversible drive and means for automatical- 'ly disen aging said drive when either of said platforms reaches a predetermined level said means being positioned alternately at said level for engagement with said platforms as they are alternately raised and lowered.

3. A hoist of the type described including a plurality of opposed platforms provided with a reversible drive and means for automatically disen said drive when either of d platforms 1' aches a predeterminedlevel, said means being positioned at said level and adapted to have a' plurality of positions for a tripping engagement with either ascending platform, the movement to either position serving to re-engage said drive.

disposed in the vicinity of said high level so as to be automatically tripped by engagement with either platform when approaching the limit of its up ward movement, and a speed check operable to slacken' the speed of said drive as either platform approaches the limit of its downward movement, said speed checlr being also disposed in the path of movement of said platforms for engagement thereby.

tripping element.

7. In a hoist of the type described,'the combination with a source of power, of mechanism for alternately raising and lowering a plurality of elevator platforms, an adjustably mounted tripping element adapted to be positioned at t 10 level to which said platforms are elevated an actuatingarm for controlling said mechanism, and flexible connections between said tripping element and said actuating arm whereby said mechanism may be operated toengapge and disengage said source of power according to the position of said tripping element. r i i 8. In a hoist of the type described, the com bination with a source of power of mechanism for alternately elevating a plurality of elevator platforms a trippingelement controlled by the movement of said platforms, an actuating arm operable by said'tripping element to engage and disengagesaid source of power, and a locking element normally tending to lock said actuating arm in power disengaging or neutral posit-ion.

9. In a hoist of the type described. the com bination with a source of power. of mechanism for alternately elevating a plurality of elevator platforms, a tripping element con trolled by the'movement of said platforms. an actuating'arm operable by said tripping element to engage and disengatre said power, flexible connections'between said tripping ele ment and said actuating arm. said tripping element being positioned for engagement by said platforms when elevated whereby auto matically to disengage said power.

10. In {L'hOlSt of the type described, the

combination with a drive shaft. a plurality 1 of elevator platforms adapted to be alternately raised and lowered, a drum, a cable shaft to said drum. wherebytowind and. un WlIlCl said cable tlierefronr,v said: mechanism:

comprising aabeveled gear ca ied by said drum, gears carried on said: drive shaft in mesh with said beveled gear but normally disengaged froinsaidf shaft, and means for engaging said gears and said shaft, inolud ing" an axially cor-ed end on said shaft and ashiftable element 1nsa1d core,-a clutching member carried in projected relation by said shift-able element andbetweensaidgears, and means-for actuating St 11. In a hoistof the type described, the combinatioir with a plurality of elevator platforms adapted to be alternately raised and lowered, ofmeohanism for r aisingand lowering said elevator platforms compris ing a drive shaft, dr-umadapted during op eration to-be driven-bysaid driveshaft ,gears on said drive shaft, a bevel gear: connected" to said'drum. means for alternately engaging" and a pawl said gears witlr said driveshaft device actuated bysaid means and cooperatmg with said drumto prevent aecidental ro tat-ion'lof said drum.

lQi l'n aliOl sll Of the type described', the combln'ation with' a pluralit y of elevator plat formsadapt'ed to be alternately raised and lowerecho'l mechanism for raisingand lower ing said'elevator platformscompr isinga drive shaft, a drum adapted during operation to be I driven by said dr-ive' shaft,- gears" on? said drive shaft, a bevel gear connected to said drum, and an actuating arm operable by the movement of said elevator platforms fi1'st'to engage one of said gears with said drive shaft, then to shiftthe dtiving connection to neutral position, and thereafter to engage the other gear with said drivesha-ft to reverse the rotation of said drum.

13. In a hoist of the type described, the combination with a plurality of elevator platforms adapted to be alternately raised and lowered, of mechanism for operating said elevator platforms comprising a drive shaft having gears thereon normally disengaged therefrom, a drum, a gear connected thereto in mesh with said gears, an actuating arm pivotally mounted adjacent said drive shaft, 7

shiftable element.-

forms to said drum, and a 1 awl and ratchet device controlled by said actuating arm for said drum.

lad n a heist of theitype described, the combination of a plurality of elevator plat forms adapted to be alternately raised and lowered, of mechanism for operating: said elevator platforms comprising a drive shaft, a drum, and reversing mechanism therebe tweenalternately to engage and disengage saicb driveshaft, an actuating: arm controlled by the movement of said elevator platforms,-, cables extending from said elevaton plat forms to said drum, said'drumbeinggroovedl to receive said cable, teeth formed ontheperipheral edges of said drum, and a double:

actingpawl device actuated by said arm to platforms are raised and lowered in proper sequence, a pivot-ally mounted actuating: arm for operating said clutch member, cables leadingffrom the opposite ends of said actuating. arm toa point near said platforms, a trip cam associated with said cables whereby said actuating arm may be swung about its pivotal point to operate said clutch memher, and a locking member normally tending to engage in a groove provided in said actuating arm to lock said clutch member in neutral position.

17. In a hoist of the class described, the combination with a source of power, of mechanism for alternately elevating a plurality of elevator platforms, tripping means con trolled by the movement of said platforms, an actuating arm operable by said tripping means to engage and disengage said source of power, and locking means normally tending to lock said actuating arm in power disengaging or neutral position.

18. In a hoist of the class described, the combination with a plurality of elevator platforms adapted to be alternately raised and lowered, of reversing mechanism for raising and; lowering said elevator platforms comprising 'a drive shaft, a drum adapted to be driven by said drive shaft, a ring gear secured to said drum, gears loosely mounted on said drive shaft and meshing with said ring gear, and means controlled by the movement of said elevator platforms for alternately engaging said gears with said shaft.

19. In a hoist of the class described, the combination with a plurality of elevator plats drive forms adapted to be alternately raised and lowered, of mechanism for operating said elevator platform comprising a drive shaft having gears thereon normally disengaged therefrom, a drum, a ring gear connected thereto and in mesh with said gears, a shiftable clutch element, means for actuating said shiftable clutch element, and automatic means controlled by the position of said elevator platforms for operating said actuating t means whereby said shiftable clutch element may engage either of said gears with said drive shaft.

20. In a hoist of the type describeohthe combination of a plurality of elevator platforms adapted to be alternately raised and combination of a plurality of elevator platforms adapted to be alternately raised and lowered, of mechanism for operating'said elevator platforms including a suspensory cable therefor, drum means for actuating said cable, an actuating arm, control cables 22. In a hoist of the type described, the combination of a plurality of elevator platforms adapted to be alternately raised and lowered, of mechanism for operating said elevator platforms vincluding a suspens'ory cable therefor, drum means for actuating said cable, a drive for said drum means including reversing mechanism for reversing the rotation of said drum means, an actuating device for said reversing mechanism, and control cables extending to said actuating device for operating the same according to the position of said elevator platforms.

28. In a hoist of the type described, the combination ofa plurality of elevator plat forms adapted to be alternately raised and lowered, of mechanism for operating said elevator platforms including a suspensory cable therefor, drum means for actuating said cable, a drive for said drum means including reversing mechanism for reversing the rotation of said drum means, an actuating device for said reversing mechanism, control cables extending to said actuating device for opcrating the same according to the position of said elevator platforms andpawl means actuated by said actuating device and cooperating with said drum means to prevent accidental rotation of said drum.

In witness whereof, I hereunto subscribe my name this 15thday of August, A. D. 1925.

CARL ZETTERLUND 

